class Solution {
public:
    ListNode* addTwoNumbers(ListNode* l1, ListNode* l2) {
        ListNode*cur1=l1,*cur2=l2;
        ListNode*newhead=new ListNode(0);
        ListNode*prev=newhead;
        int t=0;
        while(cur1||cur2||t)
        {
            if(cur1)
            {
                t+=cur1->val;
                cur1=cur1->next;

            }
            if(cur2)
            {
                t+=cur2->val;
                cur2=cur2->next;

            }
            prev->next=new ListNode(t%10);
            prev=prev->next;
            t/=10;
            
        }
        return newhead->next;

    }

};